Low-Frequency Sound Propagation in an Underwater Waveguide with a Giant Gassy Pockmark
Bottom formations known as pockmarks basically arise due to extensive gas emission. Active pockmarks are characterized by exceptionally high gas saturation and substantially reduced sound speed. The latter circumstance leads to strong attenuation of sound waves contacting with a pockmark. In the pre...
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| Published in | Journal of marine science and engineering Vol. 11; no. 1; p. 211 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
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| Abstract | Bottom formations known as pockmarks basically arise due to extensive gas emission. Active pockmarks are characterized by exceptionally high gas saturation and substantially reduced sound speed. The latter circumstance leads to strong attenuation of sound waves contacting with a pockmark. In the present paper, we study low-frequency sound propagation in a 10-km long waveguide crossing a giant pockmark. A new method of acoustic waveguide scanning based on measurement of the wavefield propagator is represented. This method allows one to explore attenuation anomalies associated with the presence of the gas-saturated bottom region. In particular, one can find out which beams fall into a pockmark area and therefore experience strong losses. Identifying such beams, as well as beams which avoid pockmark-assisted losses, one can estimate probable locations of the pockmark segment in the waveguide, provided information about the background medium is sufficient. |
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| AbstractList | Bottom formations known as pockmarks basically arise due to extensive gas emission. Active pockmarks are characterized by exceptionally high gas saturation and substantially reduced sound speed. The latter circumstance leads to strong attenuation of sound waves contacting with a pockmark. In the present paper, we study low-frequency sound propagation in a 10-km long waveguide crossing a giant pockmark. A new method of acoustic waveguide scanning based on measurement of the wavefield propagator is represented. This method allows one to explore attenuation anomalies associated with the presence of the gas-saturated bottom region. In particular, one can find out which beams fall into a pockmark area and therefore experience strong losses. Identifying such beams, as well as beams which avoid pockmark-assisted losses, one can estimate probable locations of the pockmark segment in the waveguide, provided information about the background medium is sufficient. |
| Audience | Academic |
| Author | Shakirov, Renat B Kholmogorov, Andrey O Komissarov, Alexander A Makarov, Denis V |
| Author_xml | – sequence: 1 givenname: Alexander A. orcidid: 0000-0002-8758-5085 surname: Komissarov fullname: Komissarov, Alexander A. – sequence: 2 givenname: Denis V. orcidid: 0000-0002-2568-8927 surname: Makarov fullname: Makarov, Denis V. – sequence: 3 givenname: Andrey O. orcidid: 0000-0002-6259-1614 surname: Kholmogorov fullname: Kholmogorov, Andrey O. – sequence: 4 givenname: Renat B. orcidid: 0000-0003-1202-0351 surname: Shakirov fullname: Shakirov, Renat B. |
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| SubjectTerms | Acoustic waveguides Acoustics Anomalies Attenuation gas-saturated sediment Gases low-frequency sound ocean acoustics pockmark Propagation Saturation Sediments Sound Sound propagation Sound velocity Sound waves Tomography Wave attenuation Wave propagation wavefield propagator Waveguides |
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| Title | Low-Frequency Sound Propagation in an Underwater Waveguide with a Giant Gassy Pockmark |
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